A ball-throwing machine includes a frame and a ball-throwing mechanism pivotally connected with the frame. The ball-throwing machine further includes a circuit unit. Via a first servomotor and a first linkage, the circuit unit serves to move the ball-throwing mechanism to a ball-throwing angle and drive the ball-throwing mechanism to continuously swing up and down. The frame can be pivotally mounted on a base. Via a second motor and a second linkage, the circuit unit serves to drive the frame to horizontally swing back and forth. In addition, the ball-throwing machine has a safety switch. When setting the functions of the ball-throwing machine, a user can press the safety switch to stop the operation of ball throwing so as to protect a person from being incautiously hit and injured. The circuit unit further has a malfunction detection function for detecting whether the ball-throwing machine works normally.